William



(No Model.)

W. 0. WHITEHEAD & A. L. TEETMOR.

SAND MOLDING MACHINE.

No. 364,388. Patented June '7, 1887.

R. PETERS PholoLillvcgnphOn Wllhingion. D C,

UNITED STATES PATENT OFFICE,

XVILLIAM O. WHITEHEAD AND ABRAM L.TEETOR, OF INDIANAPOLIS, INDIANA; SAIDTEETOR ASSIGNOR TO JOHN H. LATSHAV, OF SAME PLACE.

SAND-MOLDING MACHINE.

SPECIFICATION forming part of Letters Patent No. 364,388, dated June 7,1887.

Application filed March 21, 1887. Serial No. 231,767. (No model.) v

T0 at whom it may concern:

Be it known that we, W'ILLTAM 0. WHITE HEAD and ABRAM L. Tnnron, ofIndianapolis, county of Marion, and State of Indiana, have inventedcertain new and useful Improvements in Sand-Molding Machines; and we dohereby declare that the following is a full, clear, and exactdescription thereof, reference being had to the accompanying draw ings,iii-which like letters refer to like parts.

. "Our invention relates to the construction of sand-molding machines,and is an improvement upon the machine shown and described in theapplication of J. and J. H. Latshaw, filed January 10, 1887, Serial No.223,848, and in the earlier patent issued to John Latshaw, August 28,1883, No. 283,905, and will be understood from the followingdescription.

In the drawings, Figure 1 represents an in terior side View of ourimproved machine, the full lines indicating the position of the partswhenthe pattern-plate is raised, and the dotted lines indicating theposition of the movable parts of the mechanism when the patternplate islowered, the frame-work and shaft being in cross-section. Fig. 2 is aninterior end view of the same, the frame-work and pattern-plate being incross-section on the line 00 m, Fig. 1. Fig. 3 is a detailed view of thetriangular piece to which the short arm or link a is pivoted.

The framework of the machine and many of its features are substantiallythe same as shown in the application of J. and J. H. Latshaw beforereferred to, the differences which constituteourimprovementsbeinginthcmeans for sustaining the guides and in pivotingthe lower ends of the jointed levers to the hangers that support theguides in which the slides of the pattern-plate move, a different meansfor connecting the arms of the rock-shaft to the jointed levers, and aprovision for counterbalancing the weight of the pattern-plate andpatterns by springs coiled upon the ends of the shaft, as hereinaftermore fully described.

The framework of the machine consists of a base, I), mounted on rollersr,and the top piece, 2, upon which the parting-plate p rests, theseupper and lower parts being connected by uprights a, as shown in Fig. 1.Between these uprights and near each end are curved braces or hangers hh, which are bolted to the top, the lower ends of each pair meeting andbeing connected together, and furnishing a pivotal support for thelowerends of thej oi nted levers j j, as shown in Figs. 1 and 2. Thesehangers have projections or guides g, which are channeled to receive theslides s, connected to the under side of the pattern-plate, which movefreely insueh channels when the pattern-plate is being raised orlowered. The upper ends of thejointed levers are pivoted at 5 5 toprojeetions on the under side of the pattern-plate p, as shown in Fig.1, their lower ends being pivoted at 6 6 in the lower united ends of thehangers h h. Thus the pattern-plate and the mechanism connectedtherewithnamely, the jointed levers and the guides are supporteddirectly, by means of the curved hangers it h, between the ends, andfree from contact with the other parts of the frame, and the object ofthis is to prevent the jointed levers at their lower pivotal connectionfrom being thrown out of line when the pattern-plate is lowered, therebeing a tendency so to force them out of line when they are pivoted tobars uniting cross-pieces at the ends of the frame, as shown in theconstruction in the former application hereinbefore referred to.

It has been found after careful experiment that in drawing the patternfrom the sand the two ends of the pattern-plate do not descend equally,and that there is more or less differ once in the level of the ends atsuch times, and in order to remedy this we have devised the peculiarmethod of pivoting the shorter arm or link which connects the arm of therockshaft to the jointed levers herein shown, namely: this shorterarm orlink a is pivoted at one end, at 2, to the arm a. Its other end, insteadof being pivoted at the central point, 4, of the jointed lever j, as isthecase upon the other side of the machine, is pivoted at 7 to onecorner of a spherical triangle, S, all the sides and angles of which areunequal, and the upper corner of this triangle is connected at 4 withthe jointed lever 'j, and when in that position the vertical side ofthis triangle becomes the lower half of the jointed lever on that side,so that the distances from l to 5 and from a to 6 are equal. The anglesof this triangle have the following values: the angle A B O isfifty-seven and one-half degrees,rrthe angle B A G is forty-six degrees,the angle A G B is seventy-six and one-half degrees. These angles havinga fixed value, insure the relative proportional lengths of the sides,and a mathematical calculation establishes the fact that these elementsare necessary in order to effect the result desired-namely, the movementof the pattern-plate in either direction, so that its upper surface isalways in a horizontal plane. This construction, when the parts are inthe position shown in the full lines, makes the angle 672 equal to theangle 136, and when the pattern-plate is lowered and the parts are inthe position shown in the dotted lines in Fig. 1 the angles of thejointed levers on both sides are equal, indicating that the surface ofthe pattern-plate is level.

Our improvement further consists in attaching the coiled springs sp atone end to the shaft 3, coiling them around the shaft, and connectingthe other end of the spring with the brackets b b, in which the shaft isjournaled. The object of this is to use the force ofthe springs againstthe weight of the pattern-plate and patterns, so that it will act as asort of counterbalance and prevent any jerking or unsteady movement ofthe pattern-plate and its load at any point of its movement, and itaccomplishes this by throwing theforee of the spring against the rotarymovement of the shaft as the pattern-plate descends. This force beingexerted equally and constantly, prevents any sudden or irregularmovement of the pattern-plate while being lowered.

It must be understood that the working parts of the machine arepractically supported by the pairs of hangers h h and h hon each end,and are not only held free from. contact with the ends and base of theframe, but also above the floor, so that no jar of the frame orunevenness of the floor will seriously disturb the relation of theworking parts or the operation of the machine.

What we claim as our invention, and desire to secure by Letters Patent,is the following, VIZ! 1. A saudmolding machine wherein thepattern-plate is supported upon a pair of jointed levers at each end andconnected by links of unequal length to a rock-shaft supported inbrackets eon'nee'ted'with the frame,

which is revoluble in its bearings, so as to operatethe jointed leversconnected therewith and raise or lower the pattern-plate, the

shorter link pivoted at one end to an armeonnected with such rock-shaftand at the other to a projection from the jointed levers on that side ofsuch length and angle as to maintain the pattern-plate in a levelposition throughout its entire length at all points of its movement,substantially as shown and described.

2. A sand-molding machine comprising in combination a frame-work, aparting-plate on top, a rock-shaft journaled in brackets connected withsuch frame, arms on the rockshaftpivoted to links of unequal lengthswhich connect such arms to a pair of toggle'levers hinged at their upperends to the patternplateand at their lower ends to curved hang- 7o ersor braces bolted to the top of the frame and hanging down free betweenthe ends of the frame, such hangers having channeled guides to admit themovement therein of slides fastened to and beneath the pattern-plate,whereby the pattern-plate and its lead is suspended beneath theframework and free from other contact therewith in its ascent ordescent, and one or more springs coiled upon the-shaft,and connectedalso to the brackets in which such shaft is journaled, whose forceevenly resists the rotation of such shaft, substantially as shown anddescribed.

3. A sand-molding machine comprising in combination a frame-work, aparting-plate supported thereon, an armed shaft revoluble in bearingsconnected with the frame, and the pattern-plate supported upontoggle-levers at each end and upon slides moving in guides formed uponbraces hanging from the upper part of the frame and between the'endsthereof, whose united lower ends provide pivotal support for the lowerends ofthe toggle-levers, one set of'such toggle-levers being connectedto one arm of the rock-shaft by a link and the other set being connectedby a triangular frame whose sides are unequal and whose angles have thevalues hereinbefore given to a shorter link which is pivotally connectedto the other arm of the rock-shaft at a point diametrically opposite thearm con nected to the longer link, substantially as shown and described.

4-. A sand-moldiug machine comprising in combination a frame-work, apartingplate sup ported thereon, an armed shaft revoluble in bearingsconnected with the frame, and a pattern-plate supported upontoggle-levers at each end and upon slides moving in guides formed uponbraces hanging from the upper part of the frame, and between the endsthereof, whose united lower ends provide pivotal support for the lowerends of the toggle-levers, one set of such toggle-levers being-connected to an arm of the rock-shaft by a link and the other set beingconnected by a triangular frame whose sides are unequal and whose angleshave the values hereinbefore given to a shorterlink which is pivotallyconnected to the other arm of the rock-shaft at a point diametricallyopposite the arm connected to the longer link, and one or more springsconnected to the shaft and frame whose force evenly resists the rotationof the rock-shaft when the pattern-plate is being lowered, substantiallyas shown and described.

In witness whereof we have hereunto set our hands this 17th day ofMarch, 1887.

\VM. G. WI-IITEHEAD. ABRAM L. TEETOR.

Witnesses:

G. P. JACOBS, E. B. GRIFFITH.

IIO

IFS

